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Title: Quality-assurance tests of five Y-12 Kevlar-49 spools used to fabricate strands and reliability specimens for stress-rupture tests

Abstract

An important component of the composite reliability program is the assurance of quality of Kevlar 49, 380-denier yarn and epoxy-impregnated yarn. This yarn, which is used in the fabrication of W-82 components from Kevlar 49/epoxy composites, is also formed into test specimens for long-term, stress-rupture studies and reliability studies. The QA work covered in this report encompasses preparation of impregnated-yarn specimens, examination of the yarn itself and individual fibers therefrom, tensile testing of bare and impregnated yarns and heat-degraded yarns. The yarn samples were all drawn from spools of 380-denier Kevlar 49 shipped to LLNL from Y-12. The resin matrix is an amine-hardened epoxy with low viscosity and long pot life, intended for filament winding. The components are Dow epoxy resin (DER) 332 and Jeffamine T-403 triamine hardener. The stoichiometric combining ratio, which we used in our work, is 100 parts by weight resin to 44 parts hardener. Quality-assurance testing not only verifies that the yarns actually meet the manufacturer's specifications, but also provides data on the relationships between fiber characteristics and the lifetime reliability of fabricated items.

Authors:
; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Lawrence Livermore National Lab., CA (USA)
OSTI Identifier:
7120078
Report Number(s):
UCID-20078
ON: DE84012373
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ARAMIDS; QUALITY ASSURANCE; COMPOSITE MATERIALS; ELONGATION; FILAMENTS; MATRIX MATERIALS; MECHANICAL PROPERTIES; RESINS; MATERIALS; ORGANIC COMPOUNDS; ORGANIC POLYMERS; PETROCHEMICALS; PETROLEUM PRODUCTS; PLASTICS; POLYMERS; SYNTHETIC MATERIALS; 360300* - Composite Materials- (-1987)

Citation Formats

Caley, L E, Ambalal, P K, Carley, J F, Ford, T S, Moore, R L, Noecker, D J, Ross, M E, Sherry, R J, and Yoshiyama, J M. Quality-assurance tests of five Y-12 Kevlar-49 spools used to fabricate strands and reliability specimens for stress-rupture tests. United States: N. p., 1984. Web.
Caley, L E, Ambalal, P K, Carley, J F, Ford, T S, Moore, R L, Noecker, D J, Ross, M E, Sherry, R J, & Yoshiyama, J M. Quality-assurance tests of five Y-12 Kevlar-49 spools used to fabricate strands and reliability specimens for stress-rupture tests. United States.
Caley, L E, Ambalal, P K, Carley, J F, Ford, T S, Moore, R L, Noecker, D J, Ross, M E, Sherry, R J, and Yoshiyama, J M. 1984. "Quality-assurance tests of five Y-12 Kevlar-49 spools used to fabricate strands and reliability specimens for stress-rupture tests". United States.
@article{osti_7120078,
title = {Quality-assurance tests of five Y-12 Kevlar-49 spools used to fabricate strands and reliability specimens for stress-rupture tests},
author = {Caley, L E and Ambalal, P K and Carley, J F and Ford, T S and Moore, R L and Noecker, D J and Ross, M E and Sherry, R J and Yoshiyama, J M},
abstractNote = {An important component of the composite reliability program is the assurance of quality of Kevlar 49, 380-denier yarn and epoxy-impregnated yarn. This yarn, which is used in the fabrication of W-82 components from Kevlar 49/epoxy composites, is also formed into test specimens for long-term, stress-rupture studies and reliability studies. The QA work covered in this report encompasses preparation of impregnated-yarn specimens, examination of the yarn itself and individual fibers therefrom, tensile testing of bare and impregnated yarns and heat-degraded yarns. The yarn samples were all drawn from spools of 380-denier Kevlar 49 shipped to LLNL from Y-12. The resin matrix is an amine-hardened epoxy with low viscosity and long pot life, intended for filament winding. The components are Dow epoxy resin (DER) 332 and Jeffamine T-403 triamine hardener. The stoichiometric combining ratio, which we used in our work, is 100 parts by weight resin to 44 parts hardener. Quality-assurance testing not only verifies that the yarns actually meet the manufacturer's specifications, but also provides data on the relationships between fiber characteristics and the lifetime reliability of fabricated items.},
doi = {},
url = {https://www.osti.gov/biblio/7120078}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon May 07 00:00:00 EDT 1984},
month = {Mon May 07 00:00:00 EDT 1984}
}

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